Residents near the site of the worst U.S. oil pipeline leak in a decade took the commotion and smell in stride as emergency crews labored to clean up in near-freezing temperatures, and investigators searched for clues to what caused the spill.
A Valero refinery outside of New Orleans recently produced lung-damaging soot at rates that exceeded federal limits while outpacing other major U.S. refineries, according to disclosures by state and federal environmental regulators.
